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Based on the substitutability of economic activities, by comparing the profit margin of farmers' planting of food crops and non-food crops, grain growing and breeding, as well as the daily return of grain growing and working outside during 2001-2013, this paper points out that the comparative income from farmers' behavior of growing grain is not absolutely low, and the income from growing grain is higher than from breeding pigs. It also studies the effect of food subsidies on farmers' behavior of growing grain. Farmers' behavior of growing grain is a helpless choice under many constraints, including not only economic returns, but also moral sentiments, political and social factors. From yield, quality and price, government should rely on science and technology to give full play to the functions of government guidance and supervision, and enhance the enthusiasm of farmers for growing grain, to increase food production and ensure food security.


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